Happens in humans as well. The only kind thing to do is take the kitten to the vet asap to have it pts. There can be an inherited element as the link below explains so best get the female neutered as soon as she finishes suckling.was wondering what you did because its happening to my cat right now
http://en.wikipedia.org/wiki/Gastrochisis
I used to work in a neo natal unit and saw a number of babies with this defect, or with the similar Omphalocele and most of them had a difficult post-operative course and several died.